/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize.info;

import proguard.classfile.*;
import proguard.classfile.util.*;
import proguard.classfile.visitor.MemberVisitor;

/**
 * This MemberVisitor attaches a ProgramFieldOptimizationInfo instance to every field and a
 * ProgramMethodOptimizationInfo instance to every method that is not being kept that it visits.
 *
 * @author Eric Lafortune
 */
public class ProgramMemberOptimizationInfoSetter extends SimplifiedVisitor implements MemberVisitor {
    private final boolean overwrite;

    /**
     * Creates a new ProgramMemberOptimizationInfoSetter that only attaches a ProgramFieldOptimizationInfo to a member
     * if no other info is present on the member yet.
     */
    public ProgramMemberOptimizationInfoSetter() {
        this(false);
    }

    /**
     * Creates a new ProgramMemberOptimizationInfoSetter.
     *
     * @param overwrite boolean indicating whether an existing visitor info on a visited member should be overwritten or
     *        not.
     */
    public ProgramMemberOptimizationInfoSetter(boolean overwrite) {
        this.overwrite = overwrite;
    }

    // Implementations for MemberVisitor.

    public void visitProgramField(ProgramClass programClass, ProgramField programField) {
        if (programField.getVisitorInfo() == null || overwrite) {
            ProgramFieldOptimizationInfo.setProgramFieldOptimizationInfo(programClass, programField);
        }
    }

    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) {
        if (MethodLinker.lastMember(programMethod).getVisitorInfo() == null || overwrite) {
            ProgramMethodOptimizationInfo.setProgramMethodOptimizationInfo(programClass, programMethod);
        }
    }
}
